Unfortunately there is no way to bypass the system as it was designed against that. However, when you say you don't have the key fob do you mean the remote that opens the door locks?
If so do you still have a key that starts the engine? Try unlocking the driver door with the key and see if the theft light turns off.
Here is a guide that will help with this:
https://www.2carpros.com/articles/how-to-reset-a-security-system
If this doesn't work then we need to pull codes and find out what it is telling us? Lastly did they just happen one day or did something happen to the vehicle to cause this?
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
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Sunday, August 2nd, 2020 AT 5:24 PM